Signors of one-third to harlan p



6 J. w. RISKS & H. s.- SHAFT.

LOOPER FOR SEWING MACHINES.

No. 456,383. Patented July 21, 1891'.

I i; 2 y7//////A THE 7401RIS Runs 00., mum-1140., wAsnmamu v c UNITEDSTATES PATENT OFFICE.

JOHN W'. RICKS AND HENRY S. SHAFT, OF GLOVERSVILLE, NE\V YORK, AS-

SIGNORS OF ONE-THIRD TO HARLAN, P. SHUTTS, OF SAME PLACE.

LOOPER FOR SEWING-MACHINES.

SIECIFIGATION forming part of Letters Patent No. 456,383, dated July 21,1891.

Application filed September 25, 1890- Serial No. 366.170. (ModeL) To allwhom it may concern.-

Be it'known that we, JOHN W. HICKS and HENRY S.SHAFT, citizens of theUnited States, and residents of Gloversville, in the county 5 ofFulton,in the State ofNew York, have invented a certain new and usefulImprovement in Sewing-Machines, of which the following is a full, clear,and exact description.

Our invention relates to that class of sewro ing-machines which formalock-stitch through the eo-operation of a revolving hook and underthread and a reciprocating needle and upper thread.

The invention consists ina revolving hook I 5 constructed and arrangedsubstantially as we will proceed now more particularly to point out andfinally claim.

In the accompanying drawings, illustrating our invention, in the severalfigures of which 2 like parts are similarly designated, Figure l is anelevation showing a sewing-machine cloth and throat-plate in section,and also showing in elevation the presser-foot and part of its bar andthe needle and part of its bar. Fig. 2 is an elevation of thebobbin-holder detached. Fig. 3 is aplan of the bobbin-holder. Fig. 4 isaside elevation, and Fig. 5 a plan, of the bobbin-case and bobbin. Figs.6 and 7 show in different elevations the revolving hook. Fig. 8 is asection like Fig. 1, with the hook S broken away to show the barbs inengagement with the loop of needle-thread, and also showing in dottedlines the position of hooks.

In the drawings, a is the cloth-plate.

b is the throat-plate.

c is the presser-foot; d, the presser-bar; e, the needle; f, theneedle-bar; g, the needle or upper thread, and h the bobbin or underthread, all substantially of usual or approved construction andarrangement.

The bobbin-holder we prefer to use is constructed with a flange 2', bywhich it may be 5 screwed to the cloth-plate, and an arm j projectsobliquely from this flange and is made with an elbow k, which terminatesin a ring Z. A second ring m is hinged at m to the arm j, and this ringhas a block miwhich en- 50 gages a spring 02. under stress, so as to beheld in whatever position it may be given. The

parts when the loop is discharged from the spring n is secured to thearm j. Therings Z and m are counterparts, and when brought into parallelthey are adapted to retain the bobbin-caseo and its contained bobbin pand allow necessary freed om of motion to the bob.- bin-case, while atthe same time rendering access to and removal of the bobbin-case at alltimes easy. The bobbin-case has the tension-spring o and thread-eye 0and the said case is of circular outline with its rim V- shaped, therings Z and on being correspondingly beveled to receive it. The bobbinis supplied with an eye p and the bobbin-case with a post 0 ,whichenters and engages the bobbin-eye p to secure the bobbin in the case andpermit the bobbin to revolve freely within its case. To insert thebobbin-case in the bobbin-holder, the ring m is turned upon its hinge,as indicated by dotted lines in Figs. 2 70 and 3, and then thebobbin-case is laid .upon the ring Z and afterward the ring m turneddown into the full-line position shown in said figures.

The revolving hook comprises a collar q, adapted to be applied to theshaft'of the sewing-machine, as by screw (1'. This collar is suppliedwith the disk face 1', which latter has the flange 0*. Ahooks projectslaterally from this flange and then extends substantially parallel withit and may be secured thereto by a screw 8'. A hook 15 also projectslaterally from the flange and then extends substantially parallel withit, the barbs of the two hooks being in juxtaposition, but separated bya channel, and the point of the hook 3 being free, while the point ofthe hook t is buried in the flange. The hook t may be secured to theflange by a screw t. The hook t is arranged between the collar and thehook s.

The relative arrangement of the revolving hook and the bobbin-holder andbobbin-case and bobbin is shown in Fig. l and needs no furtherdescription, excepting the suggestion that the hook revolves around thebobbincasein its holder. v

In the operation of our invention the loop of the needle-thread iscaught by the barbs of the hooks s and i, and the loop, sliding backoverthe points of both hooks,-is spread sufii- ICO ciently to pass overthe bobbin-case, and is then carried around to the center and re- 15aconcealed point, and barbs on the hooks which lie close together andhave an intervening channel, substantially as described.

2. In a sewing-machine, a revolving hook composed of a collar and twosubstantially parallel hooks, one having a free point and the other aconcealed point, and barbs 011 the hooks which lie close together andhave an intervening channel, substantially as described.

JOIIN NV. RIGKS. HENRY S. SHAFT.

itnesses:

WM. M. HARRIS, JAMES RADFORD.

